Do you think there are some genres where VR doesn't really make sense?

I personally don't believe in such a thing. Even 2d platformers I would be all over that. Well more likely "2.5d"

VR is great for viewing every game, IE on a huge screen or in 3D, but I'd say there are tons of game genres that'd be bad to play as a VR environment. One example being mountain biking. On a tv it's just a game, but in VR it'd be way more intense. That's good for some games but bad for arcady ones like downhill domination.